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Class Type Oversubscription and Local Oversubscription Multipliers

Local oversubscription multipliers (LOMs) allow different oversubscription values for different class types. LOMs are useful for networks where the oversubscription ratio needs to be configured differently on different links and where oversubscription values are required for different classes. You might use this feature to oversubscribe class types handling best-effort traffic, but use no oversubscription for class types handling voice traffic. An LOM is calculated locally on the router. No information related to an LOM is signaled to other routers in the network.

An LOM is configurable on each link and for each class type. The per-class type LOM allows you to increase or decrease the oversubscription ratio. The per-class-type LOM is factored into all local bandwidth accounting for admission control and IGP advertisement of unreserved bandwidths.

The LOM calculation is tied to the bandwidth model (MAM, extended MAM, and Russian dolls) used, because the effect of oversubscription across class types must be accounted for accurately.

Note: All LOM calculations are performed by the JUNOS software and require no user intervention.

The formulas related to the oversubscription of class types are described in the following sections:

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